Changed love.graphics.newImage's optional second argument to be a table of flags. Current flags are 'mipmaps' and 'srgb'.

If mipmaps are enabled on image creation, the image will use the default mipmap filter (now 'nearest' by default.) Image:setMipmapFilter will error if the image was not created with mipmaps enabled.

--HG--
branch : minor

src/modules/graphics/Texture.h

@@ -105,6 +105,8 @@ public:
 	static void setDefaultFilter(const Filter &f);
 	static const Filter &getDefaultFilter();
 
+	static bool validateFilter(const Filter &f, bool mipmapsAllowed);
+
 	static bool getConstant(const char *in, FilterMode &out);
 	static bool getConstant(FilterMode in, const char  *&out);